Coordinated communication method using multiple terminals

Abstract

A method of performing coordinated communication by a relay station is provided. The method includes: receiving a signal from a terminal; measuring channel state information (CSI) indicating a state of a channel which receives the signal; comparing the CSI with a predetermined threshold to determine whether to decode the received signal; and if it is determined to decode the received signal, removing noise by decoding the received signal, and then performing decode and forward (DAF) in which the signal is re-encoded and transmitted to a base station, and if it is determined not to decode the received signal, performing amplify and forward (AAF) in which the received signal is amplified and forwarded to the base station. The CSI may be at least one of a frame error rate (FER), a bit error rate (BER), a signal to noise ratio (SNR), and a signal to interference plus noise ratio (SINR). Accordingly, a time delay consumed for channel decoding in hybrid DAF coordinated communication can be decreased, data transmission and resource usage can be more effectively achieved in coordinated communication using multiple terminals, and unnecessary power consumption can be decreased.

Description

TECHNICAL FIELD[0001]The present invention relates to coordinated communications, and more particularly, to a method of performing coordinated communication using multiple terminals.BACKGROUND ART[0002]Standardization works of international mobile telecommunication (IMT)-advanced which is a next generation (i.e., post 3rd generation) mobile communication system are carried out in the international telecommunication union radio communication sector (ITU-R). The IMT-advanced aims at support of an Internet protocol (IP)-based multimedia service with a data transfer rate of 1 Gbps in a stationary or slowly moving state or 500 Mbps in a fast moving state.[0003]3rd generation partnership project (3GPP) is a system standard satisfying requirements of the IMT-advanced, and prepares LTE-advanced which is an improved version of long term evolution (LTE) based on orthogonal frequency division multiple access (OFDMA) / single carrier-frequency division multiple access (SC-FDMA) transmission. The ...

AI Technical Summary

Benefits of technology

[0026]According to the present invention, a time delay consumed for channel decoding in hybrid decode and forward (DAF) coordinated communication can be decreased. Data transmission and resource usage can be more effectively achieved in coordinated communication using multiple terminals. Unnecessary power consumption can be decreased.

Problems solved by technology

However, in case of the AAF operation, there is a problem in that the AAF must be performed by storing the received signal until decoding of the received signal is complete to be able to know whether the decoding is successful.

Therefore, it is actually impossible to apply the conventional hybrid DAF method in a format in which the AAF and the DAF are combined.

Since the DemAF and the DAF both have a problem of error propagation, when implemented with the conventional hybrid DAF method, the error propagation problem still exists even if the hybrid DAF method is used.

In particular, it is assumed a situation in which a channel environment between the terminal and the relay station is an environment which must use a channel code and a decoding error occurs in this environment.

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